1 files changed, 272 insertions, 0 deletions

diff --git a/drivers/media/common/ir-functions.c b/drivers/media/common/ir-functions.c
new file mode 100644
index 000000000000..397cff8b345b
--- /dev/null
+++ b/drivers/media/common/ir-functions.c
@@ -0,0 +1,272 @@
+/*
+ *
+ * some common structs and functions to handle infrared remotes via
+ * input layer ...
+ *
+ * (c) 2003 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/string.h>
+#include <media/ir-common.h>
+
+/* -------------------------------------------------------------------------- */
+
+MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
+MODULE_LICENSE("GPL");
+
+static int repeat = 1;
+module_param(repeat, int, 0444);
+MODULE_PARM_DESC(repeat,"auto-repeat for IR keys (default: on)");
+
+static int debug = 0;    /* debug level (0,1,2) */
+module_param(debug, int, 0644);
+
+#define dprintk(level, fmt, arg...)     if (debug >= level) \
+        printk(KERN_DEBUG fmt , ## arg)
+
+/* -------------------------------------------------------------------------- */
+
+static void ir_input_key_event(struct input_dev *dev, struct ir_input_state *ir)
+{
+        if (KEY_RESERVED == ir->keycode) {
+                printk(KERN_INFO "%s: unknown key: key=0x%02x raw=0x%02x down=%d\n",
+                       dev->name,ir->ir_key,ir->ir_raw,ir->keypressed);
+                return;
+        }
+        dprintk(1,"%s: key event code=%d down=%d\n",
+                dev->name,ir->keycode,ir->keypressed);
+        input_report_key(dev,ir->keycode,ir->keypressed);
+        input_sync(dev);
+}
+
+/* -------------------------------------------------------------------------- */
+
+void ir_input_init(struct input_dev *dev, struct ir_input_state *ir,
+                   int ir_type, IR_KEYTAB_TYPE *ir_codes)
+{
+        int i;
+
+        ir->ir_type = ir_type;
+        if (ir_codes)
+                memcpy(ir->ir_codes, ir_codes, sizeof(ir->ir_codes));
+
+
+        dev->keycode     = ir->ir_codes;
+        dev->keycodesize = sizeof(IR_KEYTAB_TYPE);
+        dev->keycodemax  = IR_KEYTAB_SIZE;
+        for (i = 0; i < IR_KEYTAB_SIZE; i++)
+                set_bit(ir->ir_codes[i], dev->keybit);
+        clear_bit(0, dev->keybit);
+
+        set_bit(EV_KEY, dev->evbit);
+        if (repeat)
+                set_bit(EV_REP, dev->evbit);
+}
+
+void ir_input_nokey(struct input_dev *dev, struct ir_input_state *ir)
+{
+        if (ir->keypressed) {
+                ir->keypressed = 0;
+                ir_input_key_event(dev,ir);
+        }
+}
+
+void ir_input_keydown(struct input_dev *dev, struct ir_input_state *ir,
+                      u32 ir_key, u32 ir_raw)
+{
+        u32 keycode = IR_KEYCODE(ir->ir_codes, ir_key);
+
+        if (ir->keypressed && ir->keycode != keycode) {
+                ir->keypressed = 0;
+                ir_input_key_event(dev,ir);
+        }
+        if (!ir->keypressed) {
+                ir->ir_key  = ir_key;
+                ir->ir_raw  = ir_raw;
+                ir->keycode = keycode;
+                ir->keypressed = 1;
+                ir_input_key_event(dev,ir);
+        }
+}
+
+/* -------------------------------------------------------------------------- */
+
+u32 ir_extract_bits(u32 data, u32 mask)
+{
+        int mbit, vbit;
+        u32 value;
+
+        value = 0;
+        vbit  = 0;
+        for (mbit = 0; mbit < 32; mbit++) {
+                if (!(mask & ((u32)1 << mbit)))
+                        continue;
+                if (data & ((u32)1 << mbit))
+                        value |= (1 << vbit);
+                vbit++;
+        }
+        return value;
+}
+
+static int inline getbit(u32 *samples, int bit)
+{
+        return (samples[bit/32] & (1 << (31-(bit%32)))) ? 1 : 0;
+}
+
+/* sump raw samples for visual debugging ;) */
+int ir_dump_samples(u32 *samples, int count)
+{
+        int i, bit, start;
+
+        printk(KERN_DEBUG "ir samples: ");
+        start = 0;
+        for (i = 0; i < count * 32; i++) {
+                bit = getbit(samples,i);
+                if (bit)
+                        start = 1;
+                if (0 == start)
+                        continue;
+                printk("%s", bit ? "#" : "_");
+        }
+        printk("\n");
+        return 0;
+}
+
+/* decode raw samples, pulse distance coding used by NEC remotes */
+int ir_decode_pulsedistance(u32 *samples, int count, int low, int high)
+{
+        int i,last,bit,len;
+        u32 curBit;
+        u32 value;
+
+        /* find start burst */
+        for (i = len = 0; i < count * 32; i++) {
+                bit = getbit(samples,i);
+                if (bit) {
+                        len++;
+                } else {
+                        if (len >= 29)
+                                break;
+                        len = 0;
+                }
+        }
+
+        /* start burst to short */
+        if (len < 29)
+                return 0xffffffff;
+
+        /* find start silence */
+        for (len = 0; i < count * 32; i++) {
+                bit = getbit(samples,i);
+                if (bit) {
+                        break;
+                } else {
+                        len++;
+                }
+        }
+
+        /* silence to short */
+        if (len < 7)
+                return 0xffffffff;
+
+        /* go decoding */
+        len   = 0;
+        last = 1;
+        value = 0; curBit = 1;
+        for (; i < count * 32; i++) {
+                bit  = getbit(samples,i);
+                if (last) {
+                        if(bit) {
+                                continue;
+                        } else {
+                                len = 1;
+                        }
+                } else {
+                        if (bit) {
+                                if (len > (low + high) /2)
+                                        value |= curBit;
+                                curBit <<= 1;
+                                if (curBit == 1)
+                                        break;
+                        } else {
+                                len++;
+                        }
+                }
+                last = bit;
+        }
+
+        return value;
+}
+
+/* decode raw samples, biphase coding, used by rc5 for example */
+int ir_decode_biphase(u32 *samples, int count, int low, int high)
+{
+        int i,last,bit,len,flips;
+        u32 value;
+
+        /* find start bit (1) */
+        for (i = 0; i < 32; i++) {
+                bit = getbit(samples,i);
+                if (bit)
+                        break;
+        }
+
+        /* go decoding */
+        len   = 0;
+        flips = 0;
+        value = 1;
+        for (; i < count * 32; i++) {
+                if (len > high)
+                        break;
+                if (flips > 1)
+                        break;
+                last = bit;
+                bit  = getbit(samples,i);
+                if (last == bit) {
+                        len++;
+                        continue;
+                }
+                if (len < low) {
+                        len++;
+                        flips++;
+                        continue;
+                }
+                value <<= 1;
+                value |= bit;
+                flips = 0;
+                len   = 1;
+        }
+        return value;
+}
+
+EXPORT_SYMBOL_GPL(ir_input_init);
+EXPORT_SYMBOL_GPL(ir_input_nokey);
+EXPORT_SYMBOL_GPL(ir_input_keydown);
+
+EXPORT_SYMBOL_GPL(ir_extract_bits);
+EXPORT_SYMBOL_GPL(ir_dump_samples);
+EXPORT_SYMBOL_GPL(ir_decode_biphase);
+EXPORT_SYMBOL_GPL(ir_decode_pulsedistance);
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
+